Page 147 - Chemistry_Form_2

Chemistry
for Secondary Schools

S/N Salt Uses
9. Potash alum (a) Purifying water
.
[KAl(SO 4 ) 2 12H 2 O] (b) Used as an antiseptic
(c) In dyeing
FOR ONLINE READING ONLY
10. Ammonium salts (a) Manufacture of plastics, synthetic fibres,
dyes, explosives, and pharmaceuticals
(b) Used as fertilisers

Activity 5.15

Aim: To investigate the preservative effects of table salt
Requirements: Table salt (sodium chloride-NaCl), pieces of fresh meat, beaker,
petri dishes
Procedure

1. Take two pieces of fresh meat.
2. Sprinkle a generous amount of salt on one piece and leave the other without
salt.

3. Leave them at room temperature for 24 hours.
4. Observe and record any appearance, texture, and odour.

Questions
1. What happened to the salted and unsalted pieces of meat?

2. What can you conclude on the effects of the salt in the two pieces of meat?

Exercise 5.4
1. Classify the following substances as neutral, acidic, or basic salts: NaCl,
NaHSO and Na CO . Explain your classification.
4 2 3
2. Describe how acidic and basic salts are formed using an example for each.

3. Differentiate between a double salt and a neutral salt, giving one example in
each.

4. A salt is prepared by mixing ammonia solution and hydrochloric acids. Will
the resulting salt be acidic, basic, or neutral? Explain your answer.

140 Student’s Book Form Two

01/08/2025 11:21:11
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 140
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 140 01/08/2025 11:21:11